There are more than 5,000 confirmed exoplanets discovered outside our solar system.
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There are more stars in the universe than grains of sand on Earth.
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The Sun will eventually expand into a red giant.
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The Milky Way galaxy is part of the Local Group.
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Comets can develop long tails when near the Sun.
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The Earth's gravity keeps the Moon in orbit.
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The Earth's gravity keeps the atmosphere in place.
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The light you see from some stars today began traveling before humans existed.
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The Milky Way is just one of billions of galaxies in the universe.
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